Wind velocity profile as a function of radius for a surface pressure of 1 bar and fO₂ − IW = 0. The blue solid line represents the wind velocity profile as a function of radius, the green dashed line indicates the exobase estimation, and the orange dashed line shows the escape velocity, which decreases as ~ r⁻². The red dashed line marks the critical radius where the sonic velocity of the flow is reached, while the black solid line represents the Hill radius, beyond which material is no longer gravitationally bound to the planet. In this example, a planetary wind regime is established since r_s ≤ R_exo.